The iPhone 4S brings a reworked iOS 5 and introduces Siri, a personal voice assistant allowing you to vocally communicate with the iPhone. It comes with a 3.5" screen with a resolution of 640 x 960, but on the inside there's a twice more powerful dual-core A5 processor. The rear 8MP camera resides and it's capable of recording 1080p videos. comes with 16GB,32GB and 64GB.